I think the problem was because some of the Button widgets used <button> nodes and others didn't. In any case, now that we've converted all the Button widgets to just use <span> and <div> (except for ComboButton that's still a <table>), the fonts appear the same on IE6.

(In [23198]) Despite the checkin comment for [15016], seems like it broke things, by creating a tooltip for 1466 before 1466 exists. But I don't see a reason for that tooltip at all. Removing tooltip, fixing id's to be sequential, and adding a bunch of missing semicolons. Refs #6178.